Pneumatic Tire Noise Damper with Protruding Portions
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Solution Overview
Problem
Existing pneumatic tires with noise dampers made of sponge materials do not fully optimize the concavo-convex surface shape to effectively suppress tire cavity resonance and reduce road noise.
Innovation Solution
A pneumatic tire with a noise damper featuring a band-shaped base portion and rib-like protruding portions extending continuously across the tire width, arranged at intervals in the tire circumferential direction, which creates reentrant portions that induce vortex flows and disturb air circulation, enhancing sound absorption and resonance suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the noise damper uses a simple flat surface design, then the manufacturing is easy and structure is simple, but the road noise reduction effect is insufficient
Solution Approach 1:
The noise damper surface is segmented into multiple protruding portions arranged in the tire circumferential direction, creating reentrant portions between them. This segmentation increases surface area and disrupts sound wave reflection patterns, enhancing noise reduction effectiveness without excessive complexity
Solution Approach 2:
The protruding portions are designed with curved surfaces rather than sharp edges, and the reentrant portions create concave curved spaces. These curved geometries help scatter and absorb sound waves more effectively than flat surfaces, improving noise reduction while maintaining manufacturability
2Object-affected harmful factors
If the protruding portions are arranged closely together, then the surface area increases and sound absorption improves, but the manufacturing precision requirements increase
Solution Approach 1:
The protruding portions are designed with specific dimensional characteristics (height, width, spacing) that are optimized for noise reduction performance. The consistent geometry and spacing across the noise damper ensure effective sound wave disruption while maintaining reasonable manufacturing tolerances
Solution Approach 2:
The noise damper design specifies optimal parameters for the protruding portions including height of 5-26mm, spacing of 20-80mm in the circumferential direction, and appropriate width dimensions. These parameter ranges balance noise reduction effectiveness with manufacturing feasibility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described design significantly reduces road noise by effectively disturbing air flow and absorbing cavity resonance energy, improving noise reduction performance compared to conventional designs.
Implementation Method 1
when the air in the tire cavity flows in the circumferential direction, a part of the air enters the reentrant portions and becomes a vortex flow and goes out from the reentrant portions
Implementation Method 2
a noise damper made of a sponge material and extending in the tire circumferential direction on an inner surface of the tread portion
Data Source
AI summary
A pneumatic tire is provided with a noise damper made of a sponge material attached to a radially inner surface of the tread portion. The noise damper has protruding portions protruding from a radially inner surface of a band-shaped base portion. The protruding portions extend from one edge to the other edge of the base portion in the widthwise direction, and arranged at intervals in the tire circumferential direction. In a cross section of the tire parallel with the tire equatorial plane, the radially inner surface of each of the protruding portions includes a flat portion, and the radially inner surface of the base portion includes an arc portion parallel with the inner surface of the tread portion.